JP2002369898A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club which enables a golfer to easily feel the suppleness of a shaft and to master the ways of hitting by effectively utilizing the suppleness. SOLUTION: This golf club is constituted by mounting the front end of the shaft 1 with a head 2, then providing the rear end thereof with a grip 3. The relation between the number X (cpm) of vibrations and length Y (inch) of this golf club is X×Y<2> <=3.5×10<5> .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club suitable for practicing a long golf club, and more particularly, to a golf club in which a shaft can be easily deflected.

[0002]

2. Description of the Related Art At present, golf clubs on the market, especially No. 1 wood, which is called a driver, can easily increase the flight distance of a ball with an increase in head size and rebound force. I have to. Another factor that increases the flight distance of the ball is that the shaft has become longer.

[0003] However, in a golf club having a longer length, people have distinct advantages and disadvantages. The cause is that the bending of the shaft cannot be used well. In other words, in a long golf club using a shaft made of fiber reinforced resin, the shaft bends at the time of swing, and by effectively utilizing this bend, the head speed is maximized to increase the flight distance. However, some golfers can not feel the deflection of the shaft enough,
There is a tendency to simply swing fast, and as a result, long golf clubs cannot be used successfully.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a golf club in which the bending of a shaft can be easily felt, and a hitting method utilizing the bending effectively can be learned. It is in.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The golf club of the present invention has a head at the tip of the shaft.
Golf club with a grip on the rear end
, The frequency X (cpm) of the golf club and the club length
The relation with Y (inch) is X × Y^Two≦ 3.5 × 10 ^FiveIs
It is characterized by the following.

The frequency of a golf club is a variable that depends on the club length, head weight, shaft hardness, and shaft condition. As the club length increases, the frequency tends to decrease. Therefore, the vibration frequency X (cpm) of the golf club is specified as described above with respect to the club length Y (inch), and the vibration frequency X is made smaller than that of a general golf club, so that the deflection of the shaft is reduced. Can be easily felt. If the golf club having such a configuration is used for practice and the practice is repeated while actually hitting the ball, it is possible to learn how to hit the ball effectively utilizing the flexure of the shaft. That is, if a player learns how to effectively utilize the flexure of the shaft, it becomes possible to use a commercially available long golf club effectively.

In the above golf club, the club length Y
(inch) and the volume Z (cc) of the head are Y × 4.7 ≦ Z
It is preferable that By specifying the head volume Z (cc) with respect to the club length Y (inch) as described above, the sweet area becomes relatively large, so that even a golf club having the frequency X can be hit easily. Can be.

In the present invention, since the flexure of the shaft at the time of swing increases, the moment of inertia at a position 170 mm from the grip end is set to 1.95 × 10 ⁶ g · cm to prevent the head from feeling excessively heavy. It is preferred to be ² or less. Further, in order to make it easier to raise the hit ball and make it easier to hit with a slow rhythm, it is preferable to set the loft angle of the head to 8 degrees or more.

Although the present invention is applicable to golf clubs having any club length, it is particularly preferable to apply the present invention to long golf clubs of 45 inches or more.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 illustrates a golf club according to an embodiment of the present invention.
In the figure, a head 2 is mounted on a front end of a shaft 1 and a grip 3 is mounted on a rear end.

In the above golf club, the frequency X (cp
m) and the club length Y (inch) are X × Y ² ≦ 3.5
× 10 ⁵ , preferably 2.0 × 10 ⁵ ≦ X × Y ² ≦ 3.
It is set to 5 × 10 ⁵ . Also, the club length Y (inc
It is preferable that the relationship between h) and the volume Z (cc) of the head 2 is Y × 4.7 ≦ Z. For example, if Y = 45, X ≦ 17
2, Z ≧ 212.

Here, the frequency X (cpm) is a frequency per unit time (cycles / minute) measured by vibrating the front end of the golf club with the rear end fixed. The fixed length of the golf club rear end in this measurement is 178 mm
Should be set to.

The club length Y (inch) is measured by a traditional standard measuring method based on the Japan Golf Club Association. That is, it is the length from the contact point between the sole surface of the head 2 and the back of the neck portion to the grip end (not including the roundness of the cap).

The volume Z (cc) of the head 2 is the apparent volume of the head 2 and is determined from, for example, the amount of rise in water level when the head 2 is mounted on the shaft 1 and submerged up to its neck. Can be.

As described above, the relationship between the frequency X (cpm) and the club length Y (inch) is set to X × Y ² ≦ 3.5 × 10 ⁵ , and the frequency X is compared with that of a general golf club. By making the shaft 1 smaller, the bending of the shaft 1 can be easily felt at the time of swing. If the value of X × Y ² is too large, the bending of the shaft 1 becomes insufficient. In order to more reliably obtain the above effects, it is desirable that the frequency X be set in the range of 90 to 190 cpm and the club length Y be set in the range of 42 to 48 inches, more preferably 45 to 48 inches.

Further, the relationship between the club length Y (inch) and the volume Z (cc) of the head is set to Y × 4.7 ≦ Z, and the size of the head 2 is set sufficiently large, so that the appearance is improved. It gives an impression that it is easy to hit without feeling the club length, and the sweet area is relatively large in terms of function, so that it is possible to ensure ease of hitting. To obtain the above effects more reliably,
The volume Z of the head is preferably set to 198 cc or more. As long as the upper limit of the volume Z of the head 2 is within the range permitted by the manufacturing technology and the hindrance of the swing of the club is not hindered,
It is not particularly limited, but dare to say 600cc
It is about.

If the golf club is used for practice and the practice is repeated while actually hitting the ball,
It is possible to learn how to hit effectively utilizing the deflection of the shaft. Although this golf club is suitable for practice, it can also be used for actual golf play.

In the above golf club, the grip end 3
The moment of inertia at a position A 170 mm from e is 1.95.
It is preferable to set it to × 10 ⁶ g · cm ² or less. The swing of the golf club is composed of a combination of a rotational movement about the shoulder and a rotational movement by the return of the wrist, and the position A corresponds to the center of the rotational movement by the return of the wrist. In the above-described golf club, the deflection of the shaft 1 during swinging increases. However, by reducing the moment of inertia at the position A and reducing the swing weight, the head 2
You can make a smooth swing without feeling heavy. The lower limit of the above moment of inertia is 1.30 × 10 ⁶
g · cm ² . The golf club for general men has the above moment of inertia of 2.00 × 10 ^{6 to} 2.20.
× 10 ⁶ g · cm ² .

Further, as shown in FIG. 2, the loft angle θ of the head 2 is preferably set to 8 degrees or more. By setting the loft angle θ to be larger than that of a general driver in this manner, the hit ball is easily lifted, so that it is easier to hit with a slow rhythm. The upper limit of the loft angle θ may be 29 degrees.

As shown in FIG. 2, the loft angle θ is determined by assuming a plane P including the shaft axis and orthogonal to the reference plane B, with the head 2 installed on the reference plane B at the lie angle. When the face surface 2a is oriented in a target direction perpendicular to the plane, the angle formed by the plane P and the face surface 2a. The loft angle θ is measured at the position of the sweet spot on the face surface 2a. The sweet spot is an intersection point g between the perpendicular line drawn from the center of gravity G of the head 2 to the face surface 2a and the face surface 2a. That is, regardless of whether the face surface 2a is a flat surface or a curved surface, the loft angle θ is specified using the sweet spot position as a measurement point.

The loft angle θ can be measured by a measuring device such as a golf ball measuring table manufactured by Shoho Enterprise, a golf club angle measuring device manufactured by Golf Galley Co., or a golf club gauge manufactured by Golf Smith. . Such a measuring device may be any known device, and is not particularly limited in the present invention.

[0022]

EXAMPLE A swing weight, frequency X (cpm), club length Y (i) measured with a 12-inch meter and a 14-inch meter, respectively.
nch), head loft angle (degrees), head volume Z (c
c) Conventional golf clubs A to C having the head weight (g) and moment of inertia (g · cm ² ) at a position 170 mm from the grip end as shown in Table 1, and golf clubs D and E of the present invention. Was prepared.

The frequency X was measured using a club timing harmonizer manufactured by Fujikura Rubber Co., Ltd. in accordance with the measurement procedure of a golf bending vibrometer determined by the Japan Golf Equipment Association. If the measurement is difficult due to the head side bending downward when the shaft is easily bent and constrained to the measuring instrument, it is preferable to perform measurement in accordance with the position of the shaft at the time of constraining by moving the measurement sensor downward or the like. .

The club length Y was measured using a club measure II manufactured by Kamoshita Seikosho Co., Ltd. in accordance with the traditional standard measurement method standardized by the Japan Golf Equipment Association. Further, the loft angle was measured by using a Takao ball head measuring table manufactured by Shoho Enterprises.

The above moment of inertia was measured as follows using a moment of inertia measuring device manufactured by Inertia Dynamics. (1) Measure the center of gravity of the club. That is, a point (center of gravity) where the club is balanced on a thin ruler is measured, and the distance (mm) from the grip end to the balanced point is measured. (2) Measure the moment of inertia around the center of gravity of the club. That is, the moment of inertia about the center of gravity of the club found by the above method is measured. The moment of inertia around the position of the center of gravity is measured by mounting the club on the moment of inertia measuring device such that the center axis position of the moment of inertia measuring device coincides with the position of the center of gravity of the club. (3) From the parallel axis theorem, calculate the moment of inertia at a position 170 mm from the grip end. That is, the moment of inertia around the position of the center of gravity measured by the above-described method is calculated as MI
_G (g · cm ² ), the mass of the club is M (g), and the distance from the grip end to the center of gravity is L _G (mm), the moment of inertia MI ₁₇₀ (g · cm) at a position 170 mm from the grip end. cm ² ) is calculated by the following equation. MI ₁₇₀ = MI _G + M × [(L _G -170) / 10] ² The head-side and grip-side is deflected state downwardly upon constrained to easily meter deflection shaft in a golf club of the present invention However, the effect on the measured values is very small and negligible.

For these conventional golf clubs A to C, the flight distances before and after the practice using one of the golf clubs D and E of the present invention were evaluated.
It was shown to. With respect to the evaluation of the flight distance, five golfers for each golf club made 10 test hits before and after the practice, and the average flight distance before and after the practice was obtained. The greater the index value, the greater the flight distance. As practice using the golf clubs D and E of the present invention, each golfer practiced until he or she realized that he had learned how to hit the golf ball while effectively utilizing the deflection of the shaft during the swing.

[0027]

[Table 1] As can be seen from Table 1, the flight distance of all of the conventional golf clubs A to C increased after the practice using the golf clubs D and E of the present invention.

[0028]

As described above, according to the present invention, in a golf club in which a head is mounted at the tip of a shaft and a grip is provided at a rear end thereof, the frequency X (cpm) of the golf club and the club The relationship with the length Y (inch) is X × Y ²
Since ≦ 3.5 × 10 ⁵ , the bending of the shaft can be easily felt, and it is possible to learn how to make effective use of the bending.

[Brief description of the drawings]

FIG. 1 is a side view showing a golf club according to an embodiment of the present invention.

FIG. 2 is a side view showing a golf club head according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 shaft 2 head 2a face 3 grip 3e grip end Y club length A 170mm from grip end

Claims (4)

[Claims] In a golf club having a head attached to a tip end of a shaft and a grip provided at a rear end thereof, the relationship between the frequency X (cpm) of the golf club and the club length Y (inch) is X × Y ² ≦ 3.5 × 10 ⁵ . 2. The golf club according to claim 1, wherein the relationship between the club length Y (inch) and the volume Z (cc) of the head is Y × 4.7 ≦ Z. 3. The golf club according to claim 1, wherein the moment of inertia at a position 170 mm from the grip end is 1.95 × 10 ⁶ g · cm ² or less. 4. The golf club according to claim 1, wherein a loft angle of the head is 8 degrees or more.